Field glass



March 27, 1934. Q. E} TRAUTMANN 5 L 1,952,224

FIELD GLAS S I Hll lHlll I 1 Filed Dec. 15; 1930 H IIHIHI III I I l H32 OTTO E.TRAUTMANN OSCAR G.H. KALLENBACH INVENTORS BY I ATTORNEY Patented Mar. 27,1934 1,952,224

UNlTED'STATES PATENT OFFICE FIELD GLASS Otto E. Trautmann and Oscar G. H. Kallenbach, Rochester, N. Y., assignors to Bausch & Lomb Optical Company, Rochester, N. Y., a corporation of New York Application December '15, 1930, Serial No. 502,466

\ 4 Claims. (01. ss' 34i This invention relates to optical instruments yoke 19 has a threaded portion 24 which and more particularly it has reference to devices operates with screw 17 so that the oculars may known as field glasses or binoculars. be adjusted for focusing by turning the knob 18.

One of the objects of our invention is to pro- At the top of each barrel portion a dove-tailed vide an improved field glass which will be relagroove 25 is formed in the side wall to receive 50 tively simple in structure though efficient and a correspondingly shaped projection 26 on the convenient in operation. Another object is to apertured member 27. Rings 28 and 28', threadprovide a field glass which can be easily and ed to the inner walls of the barrel portions, have cheaply manufactured and assembled. Still anthe overhanging flanges 29 and 29' which abut other object is to provide a field glass with imagainst the members 2'7 and 27' and serve to 5 proved means for adjusting the eye pieces or keep the latter in place. The apertured members oculars for the purpose of focusing. These and 27 and 27' thus afiord convenient means for other objects and advantages reside in certain attaching a shoulder strap to the field glass. The novel features of construction, arrangement and cloth rings 30 and 30, he d n p a y rings combination of parts as will hereinafter be more 28 and 28', serve to keep dust from getting into 7 fully described and pointed out in the appended the barrels.

claims. A plate 31, having an upturned peripheral Referring to the drawing: flange 32, covers the under side of the U-shaped Fig. 1 shows a front elevation of our improved bridge m m e Th p a 31 is held against field glass. the lower ends of the two barrel portions by 73 Fig. 2 is an enlarged vertical sectional view mountings 33 and 33 which are threaded into of the same. the lower ends of the barrels and carry the Fig. 3 is a sectional view taken on line 3-3 two obj ctive l nses 34 and 34', r p c ive y.

of Fig. 1. From the foregoing, it will be apparent that Fig. 4 is a sectional view taken on line 4-4 We are able to attain the objects of our invenof Fig. 2. tion and provide an improved and efiicient type Similar reference characters refer to similar of field glass. The casing is preferably formed parts throughout the several views of the drawof a single, integral casting of a metal such as ing. aluminum. The yoke member is also preferably A preferred embodiment of our inveiftion is formed of an integral aluminum Casting. The 85 shown in the drawing whereinlO indicates, genyoke carrying the two oculars is supported at a erally, the casing of the instrument. The casing single p t, namely 011 Screw a hence if 10 is preferably formed of a single, integral castthe yoke is rocked l t y about i p the ing and comprises the two spaced barrel portions ocular tubes strike the inside of rings 28 and 85 11 and 11' which are connected by an integral 28 and find a bearing surface thereon. There- '0 bridge member 12 which has the slot 13 so that fore it is not necessary, in manufacturing, to the bridge member 12 has an inverted U-shape, exercise great care to insure a perfect sliding as shown in Fig. 3. The entire casing, including fit for the ocular tubes in order to keep them barrel portions 11 and 11 and the bridge member centered and still the field glass will function 12 may be covered by a layer of material, lndiin a highly satisfactory manner. The shoulder 95 cated at 14, such as leather, vulcanized rubberor strap loops 27 and 27 are secured directly to any other suitable material which may be applied the casing of the instrument and hence afford in any desired manner. a rigid support. The exposed screw heads have The bridge member 12 has an integral, aperbeen reduced to a minimum; the lens barrels tured boss 15 within which is rotatably mounted are practically dust-proof; the instrument is 100 the rod 16 having a screw port on 17 at its lower nicely balanced and can be easily held and end and a knurled knob or finger piece 18 fixedly focused with one hand and the structure is dusecured to its upper end. A yoke 19 has the rable and presents a neat appearance. Various two diverging arms 20 and 20' which extend modifications can obviously be made without deupwardly, through the slot 13, and into the barrel parting from the spirit of our invention. 5

portions 11 and 11', respectively. The twoarms We claim: 20 and 20' terminate, respectively, in the two 1. In a field glass, the combination of a cascircular bushing portions 21 and 21' which are ing wall having a dove-tail groove formed therethreaded to receive the oculars or eye piece tubes in, an apertured member having a projection 22 and 22' carrying the lenses 23 and 23'. The which cooperates' ith said groove, a ring threadno cdly secured to said wall, said ring having a depending flange abutting against said member.

2. A field glass comprising two lens barrels connected by a bridge member, said barrels and bridge being a single integral structure, said bridge member being disposed approximately mid-way between the top and bottom of said barrels, a bearing carried by said bridge member, a shaft rotatably carried therein, said bearing constituting the sole support of the said shaft, a screw carried by the lower end of said shaft, an operating knob carried by the upper end, an objective lens carried by each of said barrels, a yoke having two diverging arms extending upwardly into said barrels, a bushing member carried by each of said arms, and an ocular mounted in each of said bushingasaid yoke having a threaded portion cooperating with said screw whereby said oculars may be adjusted.

3. A field glass comprising a casing having two spaced barrel portions connected by and integral with a bridge member, an objective lens fixedly secured to each of said barrel portions, an elongated yoke mounted within said casing, said yoke having a threaded portion adjacent said bridge member and an arm extending upwardly from said threaded portion into each of said barrel portions, a shaft carrying screw means at its lower end and an operating knob at its upper end, and carried solely by said bridge portion, for moving said yoke and an ocular tube and lens secured to each arm of said yoke, the axis of the shaft and screw being located in the same plane as the axes of the barrels.

4. A field glass comprising a casing having two spaced barrel portions and a bridge member integral therewith and connectingsaid portions, a boss on said member, said boss having a bore, a shaftrotatably mounted in said bore and supported solely by said boss, a screw on one end of said shaft, below the boss, an operating knob on the other end of the shaft, above the boss, an objective lens carried by each of said barrel portions, a screw-threaded yoke mounted on said screw, said yoke having elongated diverging arms extending upwardly into said barrel portions, each of said arms having a bushing and an ocular carried by each of said bushings.

o'r'ro E. TRAUTMANN. OSCAR G. H. KALLENBACH. 

